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Example: SCU Configuration

Figure 17: SCU Topology Diagram

Image g017169.gif

Figure 17 shows a basic SCU configuration with three routers. Source routers A and B use loopback addresses as the prefixes to be monitored. Most of the configuration tasks and actual monitoring occurs on transit Router SCU.

Begin your configuration on Router A. The loopback address on Router A contains the origin of the prefix that is to be assigned to source class A on Router SCU. However, no SCU processing happens on this router. Therefore, configure Router A for basic Open Shortest Path First (OSPF) routing and include your loopback interface and interface so-0/0/2 in the OSPF process.

Router A:

[edit]
interfaces {
so-0/0/2 {
unit 0 {
family inet {
address 10.255.50.2/24;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.255.192.10/32;
}
}
}
}
protocols {
ospf {
area 0.0.0.0 {
interface so-0/0/2.0;
interface lo0.0;
}
}
}

Router SCU handles the bulk of the activity in this example. On Router SCU, enable source class usage on the inbound and outbound interfaces at the [edit interfaces interface-name unit unit-number family inet accounting] hierarchy level. Make sure you specify the expected traffic: input, output, or, in this case, both.

Next, configure a route filter policy statement that matches the prefixes of the loopback addresses from routers A and B. Include statements in the policy that classify packets from Router A in one group named scu-class-a and packets from Router B in a second class named scu-class-b. Notice the efficient use of a single policy containing multiple terms.

Last, apply the policy to the forwarding table.

Router SCU

[edit]
interfaces {
so-0/0/1 {
unit 0 {
family inet {
accounting {
source-class-usage {
input;
output;
}
}
address 10.255.50.1/24;
}
}
}
so-0/0/3 {
unit 0 {
family inet {
accounting {
source-class-usage {
input;
output;
}
}
address 10.255.10.3/24;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.255.6.111/32;
}
}
}
}
protocols {
ospf {
area 0.0.0.0 {
interface so-0/0/1.0;
interface so-0/0/3.0;
}
}
}
routing-options {
forwarding-table {
export scu-policy;
}
}
policy-options {
policy-statement scu-policy {
term 0 {
from {
route-filter 10.255.192.0/24 orlonger;
}
then source-class scu-class-a;
}
term 1 {
from {
route-filter 10.255.165.0/24 orlonger;
}
then source-class scu-class-b;
}
}
}

Complete the configuration tasks on Router B. Just as Router A provides a source prefix, Router B’s loopback address matches the prefix assigned to scu-class-b on Router SCU. Again, no SCU processing happens on this router, so configure Router B for basic OSPF routing and include your loopback interface and interface so-0/0/4 in the OSPF process.

Router B:

[edit]
interfaces {
so-0/0/4 {
unit 0 {
family inet {
address 10.255.10.4/24;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.255.165.226/32;
}
}
}
}
protocols {
ospf {
area 0.0.0.0 {
interface so-0/0/4.0;
interface lo0.0;
}
}
}
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